Artificial teeth



No. 626,779. Patented lune |3,I899.

W. H. BAIRD.

ARTIFJCIAL TEETH.

(Appnemo med sept. 7, was.)

(No llhdel.)

, UNITED STATES PATENT EEICE.

WILLIAM HARAH BAIRD, OF BURLINGTON, IOW'A.

ARTIFICIAL TEETH.

SPECIFICATION forming part of Letters Patent No. 626,779, dated rune i3,reed. Application filed September 7, 1898. Serial No. 690,435; (Nomodel.)

T0 f/,ZZ whom, t may concern:

Beit known that l, WILLIAM I-IARAH BAIED, a citizen of the UnitedStates, residing at Burlington, in the county of Des Moines and State ofIowa, have invented a new and useful Detachable Porcelain Facing forCrown and Bridge Vork, of which the following is a specification.

This invention is a self-retaining detachable fastening for theporcelain facing of crown and bridge work, the object being to providean exceedingly cheap and simple means for fastening the porcelain crown,which fastening being of such a character that it shall beself-retaining and shall be easily detached whenever desired.

With this object in View my invention consists, essentially, inproviding a dovetailed groove in the rear face of the porcelain crown,which groove is bifurcated at its lower end and carrying a dovetailedfastening-plate upon the metal backing,which fastening-plate isbifurcated to spread into the. divisions of the 'groove in the crown,the bifurcated end being free from the backing to permit such expansion.

The invention consists also in certain details of construction andnovelties of combination, all of which will be fully described 3ohereinafter and particularly pointed out in the appended claims. Y

In the drawings forming a part of this specification, Figure l is aperspective view showing the practical manner of applying my invention.Fig. 2 is a horizontal sectional View of a series of tooth-crownsattached according to my invention. Fig. 3 is a view showing the rearface of a tooth-crown. Fig. 4 is a detail view of the fastening member.Fig. 5 shows a slight modification, and Fig. 6 shows a slightly-modifiedform of the tooth-crown.

Referring to the drawings, A indicates the backing or retaining plate ofa bridge, and to the forward face of which are attached, by soldering,as many fastening-plates B as it is desired to fasten crowns. Thesefasteningplates B are split or bifurcated at their lower ends, as shownvat B', said split or bifurcated portions b'eing free from the back orretainl ing plate to permit of `expansion or spreading.

Each tooth-crown() is formed with a dove# tailed groove C', whichdivides at its lower end, as shown at G2, and as the fasteningplates Bare also dovetailed the crown can be easily slid upon the said plateuntil the bifurcated end of the plate meets the division of the groove.The ends of the plate will then spread and securely fasten the crownupon the backing or retaining plate. Any suitable cement may beemployed, if desired.

The groove in the porcelain may belined with platinum baked in thefacing, or a plat inum pin C3 may be placed at the division of thegroove in the crown. The plates Inay be elongated, as shown at B2, to beused for anchorage in canals of roots in bridgework. In Fig. 5 I haveshown how the fastening-plate can be struck up integral with the backingor retaining plate.

My invention is applicable to all kinds of crown and bridge work, andits cheapness, simplicity, and efficiency will be apparent to every oneskilled in the art to which it relates. It may also be used by dentistsfor continuous-gum plates, gold plates, aluminium, cel-4 luloid, orrubber plates. I f

I-Iaving thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent of the United States, is

1. A fastening for crown and bridge work,

comprising a bifurcated fastening-plate, the

ybifurcated portion being resilient, and a crown having a dovetailgroove bifurcated at its lower end, substantially as shown and described. j

y 2. A fastening for crown and bridge work, comprising a bifurcatedfastening-plate the bifurcated portion being resilient, and a crownhaving a dovetail groove divided at the lower end and having a pin atthe point of division, substantially as shown and described.

WILLIAM I-IARAH BAIRD. Witnesses:

B. D. COCHRAN, S. W. WRIGHT.

